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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a72b70d0f55f292db280979ad2670b97f723a5b38ca1f38891cd4ff1e120698' 
  AND token = '6mGYIwSRu7/qLGLmxzWMJ11nO04WafAeVFuycfdo8Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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