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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3034676f41597d1c7256f72b9f6fea97f759fd34acfdaed593efd95d11943f' 
  AND token = 'lHb+mUfInrSnlEaR6D4f5t8GHe3DYVWtyWfQ4hq8i0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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