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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e32c76b2ca6232bb57058cd7fc072cd24676ab51e97d58acd3f384cc276e380' 
  AND token = '+3isoQkfiswVSp98BEqKHKdBxFIJHr8xP9z9z3fO8CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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