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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e5716eb72ad876d382849c7a07a072bda81ea464193467e6b8a394a931614e' 
  AND token = 'NsJwMvDIff1Z7Ps01q14ow1OlLgmnr2n2qeKs6O1bk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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