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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d853208506c14c528e5e810221d7a0cf9f49b1f6c5fcb02462808f5ee24c81' 
  AND token = 'n56k+ml6N0Z0KpyRwkZclWSz4UsS8fa5vFObxovrKQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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