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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc579ed9be82992b7f7db89561879a203568692cfdb72f6e05997afb139ade1' 
  AND token = 'oJuziEvpNpwY1HSDL5zxHDITXNwv6Oi4FM8Ohz055u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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