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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed79c3ad55da882ebe0397a903f3d87ab407e3ba1a9543cdd8b4858a7eb7d071' 
  AND token = '7iJ62uMBXWGE2YM58LaP2E0vYFq03oDJiXOmSRKKpUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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