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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fc45682e5b419ea113ec6583bb83849b5e89271c0e67442292787648d3ae86' 
  AND token = 'HY4+J+6kMVu89Fj8gpR91PiaaoG3EapHEB/Du49R10k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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