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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962f9ae9e46385dd4da5978a94c180b952bae8e590438a9134e77b0f0fd9d9e3' 
  AND token = '4l6O1y+PpsnRrAwuqedNEMwk+arB+9vYtlzn67241Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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