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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04fde30755e1c37e2a4e932eb0c30e3b96a2ba9e2a06a8fe085a322d3a67b3d' 
  AND token = 'WIVTJLmsenqWtiFi7+mMXAoKhaZ7CExvRnAcYRQ/M/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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