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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58eb2c0aed546f7994910f434ac982c6cc6dca4339405e58aec5dcac97f24466' 
  AND token = 'YbWwHQ4Q41ydKufvKoY6ny57C+qU0D3ch6aR+7eIYqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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