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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3483c12eb823429843e044d149ad741f19cd37d7ff2082a7f5901e36d30cecb7' 
  AND token = 'Ou8G0BbhxNb2tLqWmv6LthgHhfyHliQ3/oY+NcL7L3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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