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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95352eae4a37daf6ed59e4bce6e2b546b64b62a8966674da7c473419a4a04d00' 
  AND token = 'utXUBohi1zRHIYciHoZtHWd/RmXlFw3zLSQgsXuPLgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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