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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea5bd34571045b0957152a9872656628f3d08ee66c85cdb548f50bc8f81daac' 
  AND token = '3+gCCY4Ifv5lHygY1+tg4+5nbE5d+AzGS161e6HXxJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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