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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066cf074c78733e322adc6efbe772e49fd0d6e16e82406f3125a1f5811a5d89c' 
  AND token = 'ZNoF6qI/EJG/5+0dAgKnOnkMHimhqMI3A4274Qeimfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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