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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012ea293e9c5c6ba8866ee24f72afa7232d60c7ded133f43fa4d0a43b17baf6e' 
  AND token = 'KgWTSK78e+HXb5MasIBipwlq9MkpMdhgFgoJzgeHVzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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