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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca76dc6077c983189fbe8c56ce4438659418029165192cbf657da0a2a312c6d7' 
  AND token = 'Jc+N9qSDlvENaPLemutl8GpF3NSvMxmHhzzf6GyFk5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}