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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77f464a9ab49a04278bcd38b7ebdc4b88b1bf1d40a86d77d5baeae24d5d1428' 
  AND token = 'xH4boT8LtiQF2cf3BxbgtB2RM5XpsmXf5dSIwm0mB/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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