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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5fdf1765667afeeacbe277e3a8be1593decaa35d35ff23483bcc708d3450a9' 
  AND token = 'pzR/PlEMnekFO8p6ssMQI4pjzbPvmadWy2HUvah4ZcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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