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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1960c210f1fd1e4d17562f69c65ff1b98d245a45d479f537b1e71472366910' 
  AND token = '+Qe3jxxrqznm08IQ6nuw1xDA3FPUfAaTeWvXQG4c32o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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