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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5c8b0b57ab089df2548f36e5b143e4552fe8ef2d2b910c0351b19ba8061a2f' 
  AND token = 'eesbhgbRVGgqW/gvgl+qJXvSEnMU6prgg/1OPSWgJKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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