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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf9c819b9bf1cee9df5ca4d312a998bb74abc6d1c2875ff8df0a17976cb197f' 
  AND token = 'kuThhI2DzX4Jh522DrdED4z0IpEDpct9sGj3v0+kM5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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