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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba66a39cf9f57b9eed9358d0a889f8f111366d902e3647d9c6c4c2b1a2d9e56' 
  AND token = 'igPjr0Aug+QIxE75v1KhkkcF2jwKSAAFaKwa7FojGrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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