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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af07f944574a78ace31fbfbd3b5b99e10b4d425c4d8a1d0b68473efe876ea7c3' 
  AND token = 'AU1D5zE35iOGEbo4+Q5BalgxtT2M2QxoG+MlN3ZA+fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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