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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6a04f4365dab169e9c8f883a288280030d0f3c95e93dcfb5ac10cfdb288965' 
  AND token = 'z6juP8QDfNFuGsNXbNoFHXZAFs3FyKF1QldLpJMx7hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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