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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc42e9801f74273d867d78811cd34f0945fe7b3b8711998bdf67f2d74506c5d4' 
  AND token = 'dLPMsAnCbyk8ARBPNF9vksP0xIQHRYwN1AeQIiRubVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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