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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ffa6dcadeb246eebe97e0d9f1ff717cc10f53e2f7eb567fb64548ac2a4c1d13' 
  AND token = 'E7D4ANzYZazcjXUP7bOBEeUt1pw8Bu6gnkhehskOWxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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