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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698d219ee536f3e26ef39d37d2a6c8008c12dac40d3641c15a5c0560ebd554ea' 
  AND token = '6ZQWkTNuMz4+VX+r+YMYWm4en5whVPRIRRq3tFcO1vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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