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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70941ed9b1a00b1ccebacd05cdd8afb049bf5385217dd04e89a115aa0b3be600' 
  AND token = '07iqawazUXQ0AQi1aKNJFmn6oeRu2AfBTyNsZ8GgEc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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