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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5d2f6a86c43ce98c4a32a7501c9902cde3c851fa32989581befa17590be1ca' 
  AND token = 'p9wDNdP5IZ2Z/M5U2MwTtRxJMUPCbCitzQbROGtHABw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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