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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76aa863870d72ac420a18d49e49b65bc7cbc80822a8d4f73f45ecbc357e59d5' 
  AND token = 'pEGZNFRgFvpXS3v5spSGrt9dP1hltckPA9+mix1lSoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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