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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc62c062d49e702168f70eb1c00bf7e9f913353108da9c092414dee7cf8b80d' 
  AND token = 'N9Rv6p3RbFK+uewVMH0dS1JdNf2ENtX0NYkVxH2P0JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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