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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b6789b89b6e2db6ad9d805716a312df16f2c595ad7cf69115b4dea4b76607e' 
  AND token = 'Erstwx45DormwIjNdVZXf0Z+nFm0HdnJM5p2E+QRUkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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