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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd48dc05f90454b238d5fdd3443146babd37b25e57320e8a135f902bfd1530cd' 
  AND token = 'wmdv9W1cOAKJj9mmApx8C+Y9OwEgrJupvez3PUwli0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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