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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53d59bf2eb3aa57b288904fe7258503c37eb1d3cd27d430e6e9f095cf2bcc8f' 
  AND token = 's23zdwcsetDl/YLh6OSriFO37PrrHT7op1shmrAF4R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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