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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e025d751981e9669d9f3f4e905553bd01b5870303c74bad1db035660e9c64cd9' 
  AND token = 'm3qZP+mjGEHZ2SMpm93cEp27kdULyKIpefLi+a6YTe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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