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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b3758d6bfb3f282287a96fb0c67364c6ed459de1b8e86e68cc1666918f4db3' 
  AND token = 'W8fx80ovlUlliQ6tZPUWkZvw4N8zmdWksIeSv6Eyq6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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