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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcb8d1ad99e9bee0d17a7bf5254b42ff12c2a25b952b2503bf435aec4ea77f4' 
  AND token = 'qE/g/n36U9862NGYTnSuW8gUhDt+xE1Akq2zLQ+oL5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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