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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b75c1721df5cb0dfb69f5e97c921270a1c6763c60a4c2b151feee770dbb00d' 
  AND token = 'kpTbSk32F8Q1/B7jGCmiEcgfW6FLyNrwzTHM0GmTFec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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