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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd94ec2b068caef85ccd2b69ac9f521e9eceadba0ca2b1b469b28cfa9f4be3eb' 
  AND token = 'iOPLPsdyCF6zVYPty8T/VRMY2HipbDyRtvsbByre2h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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