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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1615600711d5713012f294b29f9cfd10401597bd3e391cb3aca46da496334e' 
  AND token = 'P3eya3QPgU3EkZRx9EQBe+azrnwLBCnkqZkal9hWe0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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