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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fa9ed4f22eeff5cfc0e24dd22cb4680ee8fa111d03c4bb6ee9dfcb180c597b' 
  AND token = 'VX+i/N2ftASM+4bqUP8Ad4Styg4R0pduq4onrEurFh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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