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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f0cee230a23db8596cc6b64c35f52279ac94f5b43402a120333510e04593ce' 
  AND token = 'VAsu+16P/t/+JxuRZzngjOKW7IVQJd+c5fTM/dFOibs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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