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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9858f4fbfae936d7a55d4836bf4177bcae6c26575419fac095bf35f21898ca82' 
  AND token = 'NqDRJdGQZkiwoSN4Z1nQmu/LGQ/abWqq5iawcF2OGGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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