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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01af8dc04ea512313cbf425046e880d6a06c3c8f8e312f4768d21bd35d2a28b5' 
  AND token = 'B6rHXiY4KHXmyPD5AxnXehgZ4DguwTWSnqc2/vS+Oy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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