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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0f351517d3e89d8da365ec0ef1c6854ec07bd4db6dfaecdb3645fe1894523d' 
  AND token = 'vrE8fMJ9KpEkJcs/KT6YfHAons/gc/8OpU6/e6rM/ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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