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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5cdec662acb17589890cf411a3dc37035f42808ab962f3a3998b6e6edc597c' 
  AND token = 'zN5lRsymfhgcEEUTTPm7w5ejMyCdC8qXKxG9Cjg5HnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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