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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5401707463d21c0a416736e26b82e0c3a8e15c11159aded2904719ab1abc2978' 
  AND token = '8hKkQHHraW4kOrQCcR0iAnKtq4BKk6L/x902qb829TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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