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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d3ec3c9685c23cc91cb8260fe8e38c14add2d14374219dc27e83d5db1ec9ed' 
  AND token = 'MCATr6zZaIfDWqOAdemNUWodVxk0lOue4a7TSjiIXs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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