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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f777de6bbd68ff5c62e872ea3d3b40cddc4b3f00b1b9774eae798cb298959a' 
  AND token = 'YBuTM6sRZb27NBxTbqvfto8lXAdqpPCUkMib2s4T2wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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